/*
 * jQuery Impromptu
 * By: Trent Richardson [http://trentrichardson.com]
 * Version 1.6
 * Last Modified: 12/1/2008
 * 
 * Copyright 2008 Trent Richardson
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
jQuery.extend({    
    ImpromptuDefaults: { prefix:'jqi', buttons:{ Ok:true }, loaded:function(){}, submit:function(){return true;}, callback:function(){}, opacity:0.6, zIndex: 999, overlayspeed:'slow', promptspeed:'fast', show:'show', focus:0, useiframe:false },
    SetImpromptuDefaults: function(o){ 
        jQuery.ImpromptuDefaults = jQuery.extend({},jQuery.ImpromptuDefaults,o);
    },
    prompt: function(m,o){
        o = jQuery.extend({},jQuery.ImpromptuDefaults,o);
        
        var ie6 = (jQuery.browser.msie && jQuery.browser.version < 7);    
        var b = jQuery(document.body);
        var w = jQuery(window);
        
        
        
        var msgbox = '<div class="'+ o.prefix +'box" id="'+ o.prefix +'box">';        
        if(o.useiframe && ((jQuery.browser.msie && jQuery('object, applet').length > 0) || ie6))//if you want to use the iframe uncomment these 3 lines
            msgbox += '<iframe src="javascript:;" class="'+ o.prefix +'fade" id="'+ o.prefix +'fade"></iframe>';
        else{ 
            if(ie6) jQuery('select').css('visibility','hidden');
            msgbox +='<div class="'+ o.prefix +'fade" id="'+ o.prefix +'fade"></div>';
        }    
        msgbox += '<div class="'+ o.prefix +'" id="'+ o.prefix +'"><div class="'+ o.prefix +'container"><div class="'+ o.prefix +'close">X</div><div class="'+ o.prefix +'message">'+ m +'</div><div class="'+ o.prefix +'buttons" id="'+ o.prefix +'buttons">';
        jQuery.each(o.buttons,function(k,v){ msgbox += '<button name="'+ o.prefix +'button'+ k +'" id="'+ o.prefix +'button'+ k +'" value="'+ v +'">'+ k +'</button>'}) ;
        msgbox += '</div></div></div></div>';
        
        var jqib =b.append(msgbox).children('#'+ o.prefix +'box');
        var jqi = jqib.children('#'+ o.prefix);
        var jqif = jqib.children('#'+ o.prefix +'fade');

        var getWindowScrollOffset = function(){ 
            return (document.documentElement.scrollTop || document.body.scrollTop) + 'px'; 
        };        
        
        var getWindowSize = function(){ 
            var size = {
                width: window.innerWidth || (window.document.documentElement.clientWidth || window.document.body.clientWidth),
                height: window.innerHeight || (window.document.documentElement.clientHeight || window.document.body.clientHeight)
            };
            return size;
        };
        
        var ie6scroll = function(){ 
            jqib.css({ top: getWindowScrollOffset() }); 
        };
        
        var flashPrompt = function(){
            var i = 0;
            jqib.addClass(o.prefix +'warning');
            var intervalid = setInterval(function(){ 
                jqib.toggleClass(o.prefix +'warning');
                if(i++ > 1){
                    clearInterval(intervalid);
                    jqib.removeClass(o.prefix +'warning');
                }
            }, 100);            
        };        
        

        var escapeKeyClosePrompt = function(e){
            var key = (window.event) ? event.keyCode : e.keyCode; // MSIE or Firefox?
            if(key==27) removePrompt();
        };

        var positionPrompt = function(){
            var wsize = getWindowSize();
            jqib.css({ position: (ie6)? "absolute" : "fixed", height: wsize.height, width: "100%", top: (ie6)? getWindowScrollOffset():0, left: 0, right: 0, bottom: 0 });
            jqif.css({ position: "absolute", height: wsize.height, width: "100%", top: 0, left: 0, right: 0, bottom: 0 });
            jqi.css({ position: "absolute", top: "100px", left: "50%", marginLeft: ((((jqi.css("paddingLeft").split("px")[0]*1) + jqi.width())/2)*-1) });                    
        };
        
        var stylePrompt = function(){
            jqif.css({ zIndex: o.zIndex, display: "none", opacity: o.opacity });
            jqi.css({ zIndex: o.zIndex+1, display: "none" });
            jqib.css({ zIndex: o.zIndex });
        }
        
        var removePrompt = function(callCallback, clicked, msg){
            jqi.remove(); 
            if(ie6)b.unbind('scroll',ie6scroll);//ie6, remove the scroll event
            w.unbind('resize',positionPrompt);            
            jqif.fadeOut(o.overlayspeed,function(){
                jqif.unbind('click',flashPrompt);
                jqif.remove();
                if(callCallback) o.callback(clicked,msg);
                jqib.unbind('keypress',escapeKeyClosePrompt);
                jqib.remove();
                if(ie6 && !o.useiframe) jQuery('select').css('visibility','visible');
            });
        }
        
        positionPrompt();
        stylePrompt();    

        //Events
        jQuery('#'+ o.prefix +'buttons').children('button').click(function(){ 
            var msg = jqi.children('.'+ o.prefix +'container').children('.'+ o.prefix +'message');
            var clicked = o.buttons[jQuery(this).text()];    
            if(o.submit(clicked,msg))                
                removePrompt(true,clicked,msg);
        });
        if(ie6) w.scroll(ie6scroll);//ie6, add a scroll event to fix position:fixed
        jqif.click(flashPrompt);
        w.resize(positionPrompt);
        jqib.keypress(escapeKeyClosePrompt);
        jqi.find('.'+ o.prefix +'close').click(removePrompt);
        
        //Show it
        jqif.fadeIn(o.overlayspeed);
        jqi[o.show](o.promptspeed,o.loaded);
        jqi.find('#'+ o.prefix +'buttons button:eq('+ o.focus +')').focus();//focus the default button
        return jqib;
    }    
});
